I remember 6 years ago, discovering "The Great South American Journey" operated by Gap adventures (now G Adventures), a 5 month trip around the continent (although essentially a bunch of their smaller tours joined together).

Then this year, I found this: a 43 week tour of Africa, covering something like 28 countries in that time.

I was wondering - two parts, what's the longest official tour offered in the world in terms of time travelling, and which official tour covers the most number of countries?

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A two-year tour of World Heritage sites (962 places) is now available, offered by a British luxury company. By the way, it costs about 1 million pounds. It claims to cover all the sites if they are safely accessible.